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【题目】If nothing ________, the oceans will turn into fish deserts.
A.does
B.had been done
C.will do
D.is done

【答案】D
【解析】句意:如果不采取措施,海洋将变成鱼的沙漠。If引导的条件状语从句中:nothing作主语,和谓语动词原型do构成逻辑上的被动关系,用被动语态。

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